Register now to get rid of these ads!

Features Gmc blowers

Discussion in 'Traditional Hot Rods' started by coopsdaddy, Sep 1, 2012.

  1. BadBlownMotor
    Joined: Mar 25, 2009
    Posts: 109

    BadBlownMotor
    Member
    from Michigan

    I don't know how we got onto the 53 series, but yes the 6v71 and straight 671 are different in size and displacement. You can not interchange the rotors.

    Basic Blower Measurements:
    http://www.wallaceracing.com/Basic%20Blower%20Measurements.htm

    Also, don't confuse the numbers used to describe the Detroit Diesel engine. Those numbers have nothing to do with the displacement of the blower used in any series. The numbers are used to describe both the number of cylinders and the displacement of each of those cylinders.

    Example:
    6-71 = six cylinders, 71 CID per cylinder

    IIRC, an "N" after the CID per cylinder is for naturally aspirated, and "T" is turbo charged.
     
    Last edited: Oct 11, 2013
  2. BadBlownMotor
    Joined: Mar 25, 2009
    Posts: 109

    BadBlownMotor
    Member
    from Michigan

    Exactly. I think 18% faster I read somewhere. I could be wrong on the percentage, but it is faster.
     
  3. ardyboy
    Joined: Mar 5, 2008
    Posts: 664

    ardyboy

    I've had this Crower/Cragar unit sitting on the bench for a while. Looks like it might be going to a new home this weekend.
     

    Attached Files:

    Deuces likes this.
  4. fenderless
    Joined: Mar 31, 2006
    Posts: 1,286

    fenderless
    Member
    from Norway

    Thanks JonnyD:) This years version has a new intake and new heads.
    What is really cool, is that I have the original bill of sales of the Hilborn 2-port:) Dean Moon bought it, set-up for a small block chev. with potvin drive.
    Date is 1959. It has a fabricated scoop. After some research it's very likely that this was ordered and used in the Larsen & Cummings streamliner;)

    The next version will have a glimmer belt set-up......;)

    K

    .............................
    Taildragger&fenderless
     

    Attached Files:

    1947knuck and Deuces like this.
  5. kelzweld
    Joined: Jul 25, 2007
    Posts: 295

    kelzweld

    Agreed. I've had both blowers side by side and the V is shorter.
     
  6. herrakani
    Joined: Oct 11, 2013
    Posts: 3

    herrakani

    I wouldn't mind scoring a reasonably priced 6/71 core.
     
  7. superprojoe
    Joined: Feb 4, 2010
    Posts: 352

    superprojoe
    Member
    from Illinois

    [​IMG]
    Seriously bad ass right here!!!:eek:
     
  8. Louie S.
    Joined: Apr 18, 2007
    Posts: 644

    Louie S.
    Member

    A 4-71 is going to be expensive and hard to find. I have a vintage 4-71 v belt setup, but will be using it on the next project. A 6-71 is readily available, and cheaper. Plus it will make more power when you spin the 327 up. I have an 8-71 on a 1000hp big block, and love it, and have built a lot of blower motors. Don't skimp on the bottom end of that 327, unless you want to build it twice. Spend your money on a good crank and rods, a 6-71, and drive the hell out of it.
     
    Kan Kustom likes this.
  9. JohnnyD.
    Joined: Mar 10, 2007
    Posts: 57

    JohnnyD.
    Member
    from Kentucky

    FENDERLESS. That's some great history. Even Kooler that your running it. Looks like a very serious effort. I get a lot of inspiration from the late 50's early 60's. Regular Joes building things in the garage. Are you having issues with the v-belt drive?
     
  10. Yeah !!!!
    Like saying I wouldn't finding money laying on the street.

    There's plenty of them out there, seek and you shall find
     
  11. He speaks the truth!
     
  12. Attached Files:

  13. BadBlownMotor
    Joined: Mar 25, 2009
    Posts: 109

    BadBlownMotor
    Member
    from Michigan

    Attached Files:

  14. They should be the same length rotors, My guess you're v6 blower came from a turbo motor. Does it have a by-pass valve in the end housing?
     
  15. BadBlownMotor
    Joined: Mar 25, 2009
    Posts: 109

    BadBlownMotor
    Member
    from Michigan

    Are you sure we are all on the same page? I know I'm not an expert, but the picture I posted above is a 6V-71 and the case section measures 12.000 inches. According to the chart I posted near the top of this page from Wallace Racing, the case length for a 6V-71 is 12.000 inches. A straight 6-71 is suppose to be 15.000 inches. The measurement is taken between the bearing plates only. The rest of the unit is not taken into consideration for the measurement.

    I know at one time 8-71 units where built from stock GMC 8V-71 blower rotors which were put into a new aftermarket case. So, this is the only situation I know of that you may interchange rotors that I know of.

    If there is someone who is a real expert on GMC blowers that can shed some real light on this, I think we would all greatly appreciate it. If you decide to do so, please post some pictures with a tape measure showing the measurements.
     
  16. wrenchbender
    Joined: Sep 5, 2007
    Posts: 2,139

    wrenchbender
    Member

    You my good man are correct


    Chrome don't get ya home
     
  17. seb fontana
    Joined: Sep 1, 2005
    Posts: 7,134

    seb fontana
    Member
    from ct

    Scrap yard I used to go to [Before I got on HAMB] had lots of gmc's all over the place, every storage area had a few 4-6-8/71 tucked away....Then out in the yard there was a bunch more 6v's bolted on v6's and doubled up on v12's and pretty sure there was a v16 also...I used to tell every body but never saw any disappear and I never saw any of the 2 or 3-71's..Now a days they won't let pickers in...What an interesting never knew what ya gonna find place..
     
  18. 1952henry
    Joined: Jan 8, 2006
    Posts: 892

    1952henry
    Member

    Yes there was. A 1-71 also existed.
    http://www.youtube.com/watch?v=dQpwIQqTj4E

    You could supercharge your Briggs!
     
  19. Oops, I was wrong, I checked on a Detroit forum and they are different!

    71 series engines came as 1, 2, 3, 4, 6, 6v, 8v, 12v and multiples of 6v, 8v, and 12v. The largest 71 series I've heard of is 32 cylinders which was 4 modified 8v71 blocks bolted together. This design is from way before Fords modern idea of "modular engines".
     
  20. 1952henry
    Joined: Jan 8, 2006
    Posts: 892

    1952henry
    Member

    That's how I felt.
     
  21. abbe
    Joined: Sep 21, 2010
    Posts: 61

    abbe
    Member
    from sweden

  22. chaz75
    Joined: Dec 3, 2008
    Posts: 14

    chaz75
    Member
    from Mesa, AZ

  23. herrakani
    Joined: Oct 11, 2013
    Posts: 3

    herrakani

    Dayum. I was just about to ask is a 8v71 suitable for sbc:s, I got a deal for a dirt cheap core with nonscarred blades. So, add drive parts and new bearings and manifold adapter and it is good to go where a 6/71 was supposed to?


    Posted using the Full Custom H.A.M.B. App!
     
  24. el Scotto
    Joined: Mar 3, 2004
    Posts: 4,464

    el Scotto
    Member
    from Tracy, CA

    I scored a 6-71 blower over the weekend too! :)

    Supposedly it's already been rebuilt but I will double check. It came with a cool back bearing plate, blower drive, idler, and crank pulley.

    I've ordered the Street Supercharging book everyone recommends, it's less than $10 shipped from Amazon!

    I was wondering, what is the vintage of the "Street Charger" front drive/cover? Who manufactured it? I can't seem to find any good info with a Google search.


    ImageUploadedByH.A.M.B.1382377430.862331.jpg




    Posted using my dang ol' telephonamajig...
     

    Attached Files:

    1947knuck and Deuces like this.
  25. powrshftr
    Joined: Mar 29, 2013
    Posts: 4,550

    powrshftr
    Member

    Nice score!
    Your mechanic seems to have things under control though...:)


    Posted using the Full Custom H.A.M.B. App!
     
  26. landseaandair
    Joined: Feb 23, 2009
    Posts: 4,474

    landseaandair
    Member
    from phoenix

    Dyers.
     
  27. 24riverview
    Joined: Jan 13, 2008
    Posts: 945

    24riverview
    Member

    Yes Dyers and I bought mine (with that cover, used) in 1977. Haven't looked but may still be making them that way.
     
  28. fenderless
    Joined: Mar 31, 2006
    Posts: 1,286

    fenderless
    Member
    from Norway

    Sorry for the late replay JohnnyD. Thanks for the kind words:) No big issues with the V-Belt setup with the current overdrive, but we figured that it would be an issue as we are heading against 70% over:D!?

    K

    ....................................
    Taildragger&fenderless
     
  29. 3-71 on a V6 - Having trouble finding a drive for it.
     

    Attached Files:

    Deuces likes this.

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.